The shape, length, and threaded ends make this ideal for a can project.
Saw off the end under the button, machine / bore a plug for the cut off end end, drill tap some machine screws, use one for a set screw...

I have made one many years ago for a .22 with very good results.

I have just acquired a Sub-2000, this is going to have a significantly greater amount of gas to control.

With machined plug, I end up with just shy of 600cc volume

Should I even attempt this as I did for the .22, or is it just going to be a pipe bomb waiting to hurt someone?

Does anyone have an good resources of volume/round @ barrel length ratios?

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